Which two processes are the primary sources of genetic variation?
mitosis and fertilization
synapsis and disjunction
mutation and recombination
overpopulation and reproduction
Answer:
mutation and recombination
Explanation:
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
1. Balance the chemical reaction of water
(Added photo)if you can help please do I would really appreciate it!
Explanation:
hers done..........
......
Mitosis is a type of cell division that occurs
I. to make more cells so organisms can grow.
II. so organisms can replace old or damaged cells.
III. when organisms make sex cells for reproduction.
IV. only during fetal stages of development.
Answer Choices:
A. I, II, and III only
B. II, III, and IV only
C. I and II only
D. I and IV only ....
Answer:
The correct option is A.
1, 11 and 111 only.
Explanation:
This is because mitosis is a type of cell division in which a single parent cell divide into daughter cells that are genetically identical to the parent cell or have the same number of chromosomes with the parent. This type of cell division occur during growth in the body and when there is need for cell replacement from old or damaged cells. It produce sex cell which are use for sexual reproduction.
Answer:
The correct answer is C. 1 and 11 only
Explanation:
The DNA molecule is very similar among all living things. The pairings are always the same and there are only six components that make up DNA . Why is there so much diversity of life? The sugar component of the nucleotides are different. Organisms use DNA differently. The sequences of base pairs are different. Organisms contain different types of DNA .
Answer:
The reason why there is so much diversity of life, despite the fact that DNA is the same for all living things, the pairings are always the same and there are only six components that make up the DNA, is that sequences of base pairs are different.
Explanation:
DNA is the molecule that contains all the genetic information, whose structure consists of four nitrogenous bases, adenine, guanine, thymine and cytosine, plus deoxyribose and a phosphate group. This DNA molecule constitutes the basis of life and inheritance of all living beings.
The nitrogenous bases of DNA are found in a number and specific sequences, which determine the proteins and biomolecules that must be synthesized in the cells.
What makes different types of living beings and diversity of life is the length of the DNA and the sequence of bases that form part of each molecule.
The other options are not correct because:
The sugar component of DNA is always the same, not different. Organisms always use DNA in the same way. The DNA molecule is always the same.Answer:
so you dont have to read all that the answer is
C. The sequence of base pairs are different
Explanation:
you're welcome
can someone help me please <333 );
Answer:
According to Punnett Square, what can be concluded from Huntington's disease is that the disease is autosomal dominant.
Explanation:
Huntington's disease is characterized as a neurodegenerative condition, which affects body movements and progressively decreases some higher brain functions.
Inheritance plays a determining role in Huntinton's disease, being a disease transmitted from parents to children with an autosomal dominant pattern, that is, all individuals with the defective gene (H) will have the disease, while the absence of the gene (rr) also guarantees the absence of this condition.
The other options are not correct because:
Inheritance of Huntington's disease is not sex-linked. The allele that determines the Hungtinton's disease is not recessive.(WILL MARK BRAINLIEST N 20 POINTS)
Fill in: Name the organelle or organelles that perform each of the following functions.
Answer:
Chloroplast, cell wall and cell membrane, vacuoles, and mitochondria
A. chloroplasts
B. Cell wall and cell membrane
C. Plastids
D. mitochondria
Where would the rate of erosion caused by water and gravity be the fastest? down the slope of a tall mountain in a V-shaped valley over an area of flat land down a hillside
Answer:
In a V-shaped valley
Explanation: Because the v-shaped valley has more of a slope than the others.
What challenges do investigators face when conducting a scientific inquiry?
Scientific inquiry is not easy to implement because of several factors. One of the problems is taking into consideration all the (1) ________ and deciding which ones to standardize. Another problem investigators face during experimentation lies in (2)_________ the evidence.
A scientist must consider all the data gathered during the experiment and decide which way to present the evidence.
What is scientific inquiry?A scientific inquiry refers to the process of seeking out new knowledge through experimentation. It is the process through which scientists gather new knowledge.
A scientist must consider all the data gathered during the experiment and decide which way to present the evidence.
Learn more about scientific investigation: https://brainly.com/question/12877465
Can someone help me plz
Answer:
I-
Explanation:
13. Why are insertion and deletion mutations so much more damaging to the final polypeptide structure than substitution mutations?
Please help!!
Answer: Insertion or deletion results in a frame-shift that changes the reading of subsequent codons and, therefore, alters the entire amino acid sequence that follows the mutation, insertions and deletions are usually more harmful than a substitution in which only a single amino acid is altered.
Explanation:
Although DNA is present in all organisms, the genetic code contained in the DNA creates
differences between all species. The DNA of an amphibian, such as a frog, is different from
the DNA in a human because a frog's DNA
A. contains a different number and sequence of nitrogenous bases
B. contains larger, more inclusive phosphate groups
C. lacks guanine and adenosine
D. does not contain as many hydrogen bonds between base pairs.
Answer:
The DNA of an amphibian, such as a frog, is different from the DNA in a human because a frog's DNA contains a different number and sequence of nitrogenous bases (option A).
Explanation:
DNA is the molecule that contains all the genetic information of the different species of living beings, being a molecule that is present in all of them.
Although the DNA of all living beings has the same basic structure —four nitrogenous bases, a deoxyribose and a phosphate group— what makes the differences between species is the length of the DNA molecule and the different sequences of nitrogenous bases present in the molecule. It is for this reason that frog DNA is different from human DNA.
The other options are not correct because:
B. There are no differences in the phosphate groups from one species to another.
C. All DNA molecules contain guanine and adenine.
D. Hydrogen bonds between nitrogenous bases depend on the amount of paired bases, but are not related to differences in DNA between species.
HELP PLEASE
Molecules that control inherited characteristics are called
A
steroids
B)lipids
C
nitrogen molecules
D
nucleic acid
Which of the following correctly describes how DNA differs from RNA?
A. DNA has ribose sugars and uracil bases; RNA has deoxyribose sugars and thymine bases
B. DNA has deoxyribose sugars and thymine bases; RNA has ribose sugars and uracil bases
C. DNA has ribose sugars and thymine bases; RNA has deoxyribose sugars and uracil bases
D. DNA has deoxyribose sugars and uracil bases; RNA has ribose sugars and thymine bases
Answer:
B
Explanation:
DNA stands for deoxyribonucleic acid and had AGCT bases. RNA stands for ribonucleic acid and has AGCU bases.
What does diabetes have to do with your body maintaining homeostasis? Explain your answer.
Answer:
With diabetes, blood glucose is increased by normal glucagon activity, but the lack of or resistance to insulin means that blood sugar levels are unable to return to normal. This causes metabolic changes that result in diabetes symptoms like weakened blood vessels and frequent urination.
What is a niche? ( 3 should be selected )
.the food an organism eats
.where the organism lives
.how the organism lives
.a primary or secondary consumer
.the number of organisms within the ecosystem
Answer:
where the organism lives, the food an organism eats, how the organism lives
Explanation:
Someone help please!!!!!
Answer:
i think it is the second one (2) substance B to enter the cell
how do organ systems help the body function.
what does water vapor mean
Answer:
Explanation:
Water vapor is the gaseous phase of water.
Hope it helped you.
results from chemical reactions involving sunlight, air, exhaust, and
Ozone?
When a person inherits the following combinations of alleles, which is dominant? Remember, the answer can be one of the alleles or
both of the alleles.
• A and B
• A and O
. B and O
Answer:
how do u post question lol
Answer:
You need just one copy to be dominant. Let's assume A is dominant so A & B
Heyy! please help mee. This is missing and I need it turned in asap!
What is the most basic level of organization?
Name one thing smaller than a cell.
What is the third level of organization? and give an example of it______________________________.
An individual is also known as a ______________________________
Many organisms that are the same species are called a _______________________
What factor is NOT considered when looking at a community of organisms?
All biomes together create the ________________________
Answer:
Living things are highly organized and structured, following a hierarchy that can be examined on a scale from small to large. The atom is the smallest and most fundamental unit of matter. It consists of a nucleus surrounded by electrons. Atoms form molecules. A molecule is a chemical structure consisting of at least two atoms held together by one or more chemical bonds. Many molecules that are biologically important are macromolecules, large molecules that are typically formed by polymerization (a polymer is a large molecule that is made by combining smaller units called monomers, which are simpler than macromolecules). An example of a macromolecule is deoxyribonucleic acid (DNA) (Figure 1), which contains the instructions for the structure and functioning of all living organisms.

Figure 1. All molecules, including this DNA molecule, are composed of atoms. (credit: “brian0918″/Wikimedia Commons)
Some cells contain aggregates of macromolecules surrounded by membranes; these are called organelles. Organelles are small structures that exist within cells. Examples of organelles include mitochondria and chloroplasts, which carry out indispensable functions: mitochondria produce energy to power the cell, while chloroplasts enable green plants to utilize the energy in sunlight to make sugars. All living things are made of cells; the cell itself is the smallest fundamental unit of structure and function in living organisms. (This requirement is why viruses are not considered living: they are not made of cells. To make new viruses, they have to invade and hijack the reproductive mechanism of a living cell; only then can they obtain the materials they need to reproduce.) Some organisms consist of a single cell and others are multicellular. Cells are classified as prokaryotic or eukaryotic. Prokaryotes are single-celled or colonial organisms that do not have membrane-bound nuclei or organelles; in contrast, the cells of eukaryotes do have membrane-bound organelles and a membrane-bound nucleus.
In larger organisms, cells combine to make tissues, which are groups of similar cells carrying out similar or related functions. Organs are collections of tissues grouped together performing a common function. Organs are present not only in animals but also in plants. An organ system is a higher level of organization that consists of functionally related organs. Mammals have many organ systems. For instance, the circulatory system transports blood through the body and to and from the lungs; it includes organs such as the heart and blood vessels. Organisms are individual living entities. For example, each tree in a forest is an organism. Single-celled prokaryotes and single-celled eukaryotes are also considered organisms and are typically referred to as microorganisms.
All the individuals of a species living within a specific area are collectively called a population. For example, a forest may include many pine trees. All of these pine trees represent the population of pine trees in this forest. Different populations may live in the same specific area. For example, the forest with the pine trees includes populations of flowering plants and also insects and microbial populations. A community is the sum of populations inhabiting a particular area. For instance, all of the trees, flowers, insects, and other populations in a forest form the forest’s community. Keep in mind that the community level only consists of living organisms. The forest itself is an ecosystem; this is the first level that contains non-living aspects of a given area that impact the living things in that environment. An ecosystem consists of all the living things in a particular area together with the abiotic, non-living parts of that environment such as nitrogen in the soil or rain water. At the highest level of organization (Figure 2), the biosphere is the collection of all ecosystems, and it represents the zones of life on earth. It includes land, water, and even the atmosphere to a certain extent.
In which sequence are the celestial objects correctly listed in order from the smallest mass to the largest mass?
Answer:
I think its A)
hope it helps.
From the smallest mass to the largest mass we have Saturn , solar system Milky Way , universe
The universe is everything from entire space, the stars , planets , galaxies, till the smallest forms of matter and energy. Milky Way is refereed to as our Galaxy containing billions of stars, inclusive of our Sun together with dust and gasThe solar system consists of the Sun and all objects orbiting around it, This includes the planets, moons, asteroids, comets and meteoroids.Saturn is the sixth planet from the sun and the second largest after Jupiter. it is called the gas-giant planet made up of mostly hydrogen (H2) and helium (He).See related answer here:https://brainly.com/question/16159267
DNA strand thingy (9th grade biology) (multiple choice)
What human cells are not produced from meiosis?
Answer:
most eukaryotic cells that are not involved in the production of gametes undergo mitosis. These cells, known as somatic cells, are important to the survival of eukaryotic organisms, and it is essential that somatic parent and daughter cells do not vary from one another.
Explanation:
Examples of mitigation projects include which of the following?
1. Greenway
II. Fish ladder
III. Wildlife corridor
A. I,II, and III
B. Il only
C. I and III only
O D. II and III only
9
Answer: A
Explanation:
I took this quiz
Answer:
I, II and III
Explanation:
just took the test
Which structure in some animals functions at the same level of organization as the kidney and heart? F.) Digestive system G .)Pelvic bone H.) Blood J .)Nerve cell
Answer:
Pelvic bone
Explanation:
To correctly answer this, we need the level of organization to which the two given examples belong to.
The kidney and the heart are regarded to as organs. They are called organs in the sense that different tissues fuse into them to make them organs
Now, the answer we are to select will be an organ too
Digestive system is incorrect as we can see that this is a system. It is at a higher level of organization compared to kidney and heart
The Blood is incorrect. The blood is generally regarded as a tissue
The nerve cell is a cell and as such is at a lower level of organization
The correct answer is the pelvic bone
This is because, generally, a bone is regarded as an organ and the pelvic bone is a bone too. Hence, it is only right to state that the pelvic bone stands at the same organization level as the kidney and heart
Answer:
G
Explanation:
I’m smart
pls pls help!! :( it’s due in an hour
Answer:
a just learned this in my biology class
To reproduce, female elephants produce eggs and male elephants produce sperm. Offspring are produced by the fusion of an egg with a sperm cell. Which statement is true about the offspring?
A. The offspring are genetically identical to the parents because they are produced by sexual reproduction.
B. The offspring are genetically distinct from the parents because they are produced by sexual reproduction.
C. The offspring are genetically distinct from the parents because the egg and sperm are both diploid.
D. The offspring are genetically identical to the parents because the egg and sperm are both diploid.
Answer:
The right answer is B. The offspring are genetically distinct ... by sexual reproduction.
Explanation:
Sexual reproduction, as opposed to asexual reproduction, indicates that the propagation of a species involves male and female gametes. It is the main method of reproduction of multicellular organisms.
In the first stage of sexual reproduction, meiosis, the number of chromosomes is reduced from a diploid number (2n) to a haploid number (n). During fertilization ("fertilization"), haploid gametes come together to form a diploid zygote and restore the initial number of chromosomes (2n).
How would you measure the size of a population of gray squirrels in a woodland?
Answer:
Um, well the formula for population growth (is that what you are asking?) is
(birth rate + immigration rate) - (death rate + emigration)
Explanation:
emigration is animals moving out and immigration is animals moving into the population.
The diagram below shows some of the steps in protein synthesis.
Transfer to site of
protein synthesis
Nucleus
-mRNA
DNA
Unwinding
of DNA
Rewinding
of DNA
The section of DNA being used to make the strand of mRNA is known as a
1.
carbohydrate
2.
gene
3.
ribosome
4.
chromosome
Answer:
According to the diagram shown, the section of DNA used to make the mRNA strand is known as a gene (option 2).
Explanation:
Gene consists of a DNA fragment that codes for the synthesis of a specific protein that defines the structural or functional trait of a living being.
When DNA is transcribed into mRNA, each section of transcribed DNA is part of a gene. The information travels to ribosomes in the cytoplasm where protein synthesis occurs.
A complete DNA molecule forms a chromosome, which contains the genes with information to define specific traits of a species.
The other options are not correct because:
1.Carbohydrate is a biomolecule that is not involved in the genetic process.
3. Ribosome is where protein synthesis occurs.
4. Chromosome is the complete DNA molecule.
The section of DNA being used to make the strand of mRNA is known as - 2. gene
Geneis the basic physical and functional unit of heredity.Genes are made up of DNA, a particular base sequence of DNA is termed as a gene for a specific protein.Each gene is a unique base sequence.Some genes act as instructions to make molecules called proteins. However, many genes do not code for proteins.In humans, genes vary in size from a few hundred DNA bases to more than 2 million basesThese sequences are encoded in the form of mRNA during transcription and then move to the translation process and make proteins.Thus, The section of DNA being used to make the strand of mRNA is known as - 2. gene
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